Results 31 to 40 of about 541,779 (282)

Conventional and Advanced Exergy-Based Analysis of Hybrid Geothermal–Solar Power Plant Based on ORC Cycle

Applied Sciences, 2020
Today, as fossil fuels are depleted, renewable energy must be used to meet the needs of human beings. One of the renewable energy sources is undoubtedly the solar–geothermal power plant.
Massomeh Alibaba, Razieh Pourdarbani, Mohammad Hasan Khoshgoftar Manesh, Israel Herrera-Miranda, Iván Gallardo-Bernal, José Luis Hernández-Hernández   +5 more
doaj   +1 more source

Periodic Variation of Solar Flare Index for the Last Solar Cycle (Cycle 24)

Advances in Astronomy, 2021
In this study, we used the flare index (FI) data taken from Kandilli Observatory for the period of 2009–2020. The data sets are analyzed in three categories as Northern Hemisphere, Southern Hemisphere, and total FI data sets.
Atila Ozguc, Ali Kilcik, Volkan Sarp, Hülya Yeşilyaprak, Rıza Pektaş   +4 more
doaj   +1 more source

The State of Self-Organized Criticality of the Sun During the Last 3 Solar Cycles. I. Observations

, 2010
We analyze the occurrence frequency distributions of peak fluxes $P$, total fluxes $E$, and durations $T$ of solar flares over the last three solar cycles (during 1980--2010) from hard X-ray data of HXRBS/SMM, BATSE/CGRO, and RHESSI. From the synthesized
B.R. Dennis, C. Tranquille, D.A. Biesecker, D.A. Biesecker, D.W. Datlowe, E.T. Lu, J.A. Nousek, K.R. Bromund, M.J. Aschwanden, M.J. Aschwanden, Markus J. Aschwanden, N.B. Crosby, N.B. Crosby, R. Perez Enriquez, R.A. Schwartz, R.P. Lin, R.P. Lin, S. Christe, T. Bai, T.T. Lee, W. Cash, Y. Su   +21 more
core   +1 more source

Solar Polar Fields During Cycles 21 --- 23: Correlation with Meridional Flows

, 2010
We have examined polar magnetic fields for the last three solar cycles, {$\it{viz.}$}, cycles 21, 22 and 23 using NSO Kitt Peak synoptic magnetograms. In addition, we have used SoHO/MDI magnetograms to derive the polar fields during cycle 23.
A.C. Layden, A.R. Choudhuri, A.R. Choudhuri, C. Mercier, D.A. Haber, D.H. Hathaway, D.H. Hathaway, D.H. Hathaway, E.E. Benevolenskaya, E.E. Benevolenskaya, E.N. Parker, E.N. Parker, H.D. Babcock, H.W. Babcock, K. Schatten, K.H. Schatten, M. Dikpati, M. Dikpati, M. Dikpati, M. Steenbeck, N. Gopalswamy, P. Fox, P. Janardhan, P.H. Scherrer, R.W. Komm, S. Ananthakrishnan, S. Basu, S. Gosain, Susanta K. Bisoi, T.L. Duvall Jr., V. Domingo, Y. Wang   +31 more
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New dynamo pattern revealed by solar helical magnetic fields [PDF]

, 2009
Previously unobservable mirror asymmetry of the solar magnetic field -- a key ingredient of the dynamo mechanism which is believed to drive the 11-year activity cycle -- has now been measured.
A. Pevtsov, Abramenko, Abramenko, Bao, Bao, Brandenburg, Choudhuri, D. D. Sokoloff, Gao, Hagino, Hagino, Haiqing Xu, Hale, Hongqi Zhang, K. Kuzanyan, Kleeorin, Kuzanyan, Otmianowska-Mazur, Parker, Pevtsov, Pevtsov, Pevtsov, Pevtsov, Pevtsov, Seehafer, Seehafer, Sokoloff, Sokoloff, Sokoloff, Su, T. Sakurai, Tanaka, Xu, Yeates, Yu Gao, Zhang, Zhang, Zhang, Zhang   +38 more
core   +1 more source

Thermodynamic Analysis and Sizing of a Small Scale Solar Thermal Power System Based on Organic Rankine Cycle

Journal of Sustainable Development of Energy, Water and Environment Systems, 2020
This paper presents the feasibility analysis of a small-scale low-temperature solar organic Rankine cycle power system. The heat transfer fluid for running the organic Rankine cycle system is hot water with a temperature of 120 °C provided by an ...
Khaled Hossin, Khamid Mahkamov, Basim Belgasim   +2 more
doaj   +1 more source

The 8‐Year Solar Cycle During the Maunder Minimum

AGU Advances, 2023
The presence of grand minima, characterized by significantly reduced solar and stellar activity, brings a challenge to the understanding of solar and stellar dynamo. The Maunder Minimum (1645–1715 AD) is a representative grand solar minimum.
Limei Yan, Fei He, Xinan Yue, Yong Wei, Yuqi Wang, Si Chen, Kai Fan, Hui Tian, Jiansen He, Qiugang Zong, Lidong Xia   +10 more
doaj   +1 more source

Thinning of the Sun's magnetic layer: the peculiar solar minimum could have been predicted

, 2012
The solar magnetic activity cycle causes changes in the Sun on timescales that are relevant to human lifetimes. The minimum in solar activity that preceded the current solar cycle (cycle 24) was deeper and quieter than any other recent minimum.
Basu, Sarbani, Broomhall, Anne-Marie, Chaplin, William J., Elsworth, Yvonne   +3 more
core   +1 more source

Solar Cycle 23: An Anomalous Cycle? [PDF]

The Astrophysical Journal, 2004
The latest SOHO VIRGO total solar irradiance (TSI) time series is analyzed using new solar variability measures obtained from full-disk solar images made at the San Fernando Observatory and the Mg II 280 nm index. We discuss the importance of solar cycle 23 as a magnetically simpler cycle and a variant from recent cycles.
Giuliana de Toma, Oran R. White, Gary A. Chapman, Stephen R. Walton, Dora G. Preminger, Angela M. Cookson   +5 more
openaire   +1 more source

A New Formula for Predicting Solar Cycles

, 2019
A new formula for predicting solar cycles based on the current theoretical understanding of the solar cycle from flux transport dynamo is presented. Two important processes---fluctuations in the Babcock-Leighton mechanism and variations in the meridional
Choudhuri, Arnab Rai, Hazra, Gopal
core   +1 more source